I've just finished the initial conversion of PeteSearch, my Firefox plugin that remixes Google search results, to IE7:
http://petewarden.typepad.com/searchbrowser/2007/07/first-petesearc.html

It's open-source, and I've documented the somewhat obscure process of writing a IE 'browser helper objects' to help other developers. Philipp, Ionut and the rest of the community here have been a great help with the Firefox version, any testing you can do on this IE port will be much appreciated!

thanks,
   Pete